Amount of alignment error (in degrees) induced in each group was measured. Slit-lamp photographs were analyzed using Adobe Photoshop (version 7.0). Reference marks were placed at 3-, 6-, and 9-o'clock positions on the limbus. One group (55 patients) had preoperative marking of both eyes done with bubble marker (ASICO AE-2791TBL) and the other group (55 patients) with pendulum marker (Rumex(®)3-193). Toric IOLs were implanted in 180 eyes of 110 patients. To compare the accuracy of two different methods of preoperative marking for toric intraocular lens (IOL) implantation, bubble marker versus pendulum marker, as a means of establishing the reference point for the final alignment of the toric IOL to achieve an outcome as close as possible to emmetropia.
#Itrace abberometer manual
It can eliminate the potential systematic errors resulting from varying head positions during the preoperative keratometry measurement and from manual marking. The TRP marking method using the iTrace aberrometer is simple and accurate for preoperative marking of toric IOLs. The mean toric IOL misalignment was lesser but without significance in the TRP marking group than in the SHM marking group after 3 postoperative months (2.66° ± 1.42° versus 3.29° ± 1.67° P=0.295). There was no statistically significant difference in BCVA, UDVA, preexisting corneal astigmatism, or residual astigmatism between the groups before or after surgery (P > 0.05). The follow-up duration was 3 months after cataract surgery.įifteen eyes of 15 patients were in the TRP marking group and 15 eyes of 15 patients in the SHM marking group. TRP marking involved marking three points randomly in the corneal limbus of the patients and accurately marking the horizontal meridian was not required. All patients were prospectively randomized into the TRP marking group or slit-lamp horizontal meridian (SHM) marking group. Thirty eyes of 30 patients undergoing cataract surgery with coexisting corneal astigmatism of over 1.0 D were included in this study. Prospective, randomized comparative trial. Department of Ophthalmology, Guangdong Eye Institute, Guangdong Academy of Medical Sciences, Guangdong Provincial People's Hospital, Guangzhou, China. The aberrometers showed more agreement at a pupil diameter of 6 mm compared to 4 mm.To evaluate the clinical outcome of the three-random-point (TRP) marking method for toric intraocular lens (IOL) alignment using the iTrace aberrometer (Tracey Technologies Corp., Houston, TX). These results suggest that in healthy eyes, the two aberrometers may vary in some details. The iTrace and OPD Scan showed the largest number of differences for aberrations of internal optics rather than total aberrations for both pupil diameters. Aberrations of the internal optics showed significant differences in the mean values of total RMS, spherical aberration (Z4,0), and coma (Z3,-1) between the two devices (p<0.001, p=0.01, p<0.001). At a pupil diameter of 6 mm, the two instruments showed a similar number of total aberrations. Aberrations of the internal optics showed significant differences in the mean values of total RMS, coma (Z3,-1), and trefoil (Z3,3) between the iTrace and OPD Scan (p<0.001, p=0.01, p<0.001) for the same pupil diameter of 4 mm. These parameters, together with the refractive parameters, were then analyzed and complimented by paired t-tests.Īt a pupil diameter of 4 mm, the number of total aberrations in the entire eye showed significant differences for the mean values of spherical aberrations (Z4,0) obtained with the OPD Scan and iTrace aberrometers (p=0.001). For each aberrometer and each eye, the averaged Zernike data were used to calculate various root-mean-square (RMS) data. Aberrations of internal optics and total aberrations were compared for the two aberrometers. We compared the aberrations obtained from measurements obtained at pupillary diameters of 4 mm and 6 mm with the OPD Scan and iTrace. Following pupil dilation, aberrations were measured with the iTrace and OPD Scan. To compare and evaluate the total and internal aberrations measured by two aberrometers: the laser ray tracing aberrometer (iTrace, Tracey Technology) and the automatic retinoscope aberrometer (OPD Scan, Nidek).Ī total of 54 healthy eyes were enrolled in the study.
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